@media (-webkit-min-device-pixel-ratio:1.5),(min-device-pixel-ratio:1.5)
  .border-1px
    &:after
      -webkit-transform: scaleY(0.7)
      transform: scaleY(0.7)

@media (-webkit-min-device-ratio:2),(min-device-pixel-ratio:2)
  .border-1px
      &:after
        -webkit-transform: scaleY(0.5)
        transform: sacle(0.5)

// stricky footer 中clearfix固定写法
.clearfix
  display: inline-block
  &:after
    display: block
    content "."
    height: 0
    line-height: 0
    clear: both
    visibility: hidden

   